OCR & Processing Speed

Tips & How to Information
9.0, 11
Recognition, Processing


Processing speed is important when high volumes of scanned pages of paper documents have to be processed/converted using Optical Character Recognition. Below some on this topic,

  • Optical Character Recognition is
    • a multi-step process and each of the processing step can be very CPU intense (e.g. image pre-processing or layout analysis)
    • a high number of images and PDFs require fast hard disk throughput
    • processing speed also depends on the complexity of the input document, for example the document type, structure, image quality, languages, etc.
  • OCR quality and processing speed are linked, the general rule is
    • Recognition quality is direct proportional to the required processing time
    • Low quality documents need more CPU time and are processed slower than document images in high quality

How to increase the processing speed?

  • CLI Tool offers a fast processing mode that is especially designed to optimise processing speed/accuracy balance for images of good quality.
  • If the image quality is not known before, it is recommend to use the balanced mode, here the technology makes the “internal” decision.
  • Use of multiple cores (CPUs) should be considered to speed up the processing time and efectively increase the throughput.
  • The good news - OCR Scalability is built in CLI Tool. Key for multiprocessing mode >>
  • The type of OCR processing also influences the processing time/throughput
  • Pure text extraction without document layout retention is faster than exporting to a format where the layout has to be reconstructed.
  • Image-resolution changes and MRC compression of the generated PDFs will influence the processing speed.
    • Different PDF export parameters are available: Balanced, MaxSpeed, MaxQuality, MinSize. PDF Export Keys >>

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